Introduction
Top 10:- Questions and Answers for improving and understanding MongoDB Database. Learn and Understand MongoDB Database like Pro.
1. Question: What is MongoDB?
Answer: MongoDB is an open-source NoSQL database that uses a document-oriented data model. It is designed for flexibility, scalability, and ease of development.
2. Question: What is a "document" in MongoDB?
Answer: In MongoDB, a document is a data structure composed of field-value pairs. It is similar to a row in a relational database but can have nested structures.
3. Question: What is the primary key in MongoDB?
Answer: In MongoDB, the primary key is called the "_id" field. It uniquely identifies each document in a collection.
4. Question: How do you insert a document into a MongoDB collection?
Answer: You can insert a document into a MongoDB collection using the insertOne or insertMany methods.
5. Question: What is a "collection" in MongoDB?
Answer: A collection in MongoDB is a grouping of related documents. It is similar to a table in a relational database.
6. Question: What is the purpose of an "index" in MongoDB?
Answer: An index in MongoDB improves query performance by allowing the database to quickly locate and access specific documents in a collection.
7. Question: How do you update documents in a MongoDB collection?
Answer: You can update documents in a MongoDB collection using the updateOne or updateMany methods, specifying the filter criteria and the modifications to apply.
8. Question: What is the Aggregation Framework in MongoDB used for?
Answer: The Aggregation Framework in MongoDB is used for performing complex data transformations and calculations on data stored in a collection.
9. Question: How do you delete documents from a MongoDB collection?
Answer: You can delete documents from a MongoDB collection using the deleteOne or deleteMany methods, specifying the filter criteria for deletion.
10. Question: What is the purpose of the "find" method in MongoDB?
sql**Answer:** The "find" method in MongoDB is used to query a collection and retrieve documents that match specific criteria. It is the primary method for reading data from a collection.
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